990689640825 has 48 divisors (see below), whose sum is σ = 1751461042176. Its totient is φ = 492363648000.

The previous prime is 990689640799. The next prime is 990689640869. The reversal of 990689640825 is 528046986099.

990689640825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 990689640825 - 2⁶ = 990689640761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3717817 + ... + 3975366.

It is an arithmetic number, because the mean of its divisors is an integer number (36488771712).

Almost surely, 2^990689640825 is an apocalyptic number.

It is an amenable number.

990689640825 is a deficient number, since it is larger than the sum of its proper divisors (760771401351).

990689640825 is a wasteful number, since it uses less digits than its factorization.

990689640825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7693314 (or 7693309 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 66.

The spelling of 990689640825 in words is "nine hundred ninety billion, six hundred eighty-nine million, six hundred forty thousand, eight hundred twenty-five".